Composites, Fiberglass & Advanced Materials worked example

Resin Waste Cost at 72% share of waste charged to this job: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop share of waste charged to this job to 72%, then walk the calculation through step by step. Estimate cost of wasted resin, hardener, catalyst, gelcoat, or adhesive.

The inputs for this scenario

  • Wasted mixed resin weight: 34 lb (held at the documented default)
  • Mixed resin cost: 6.8 $ / lb (held at the documented default)
  • Share of waste charged to this job: 72 % (the input this scenario stresses; the baseline uses 100)
  • Disposal and cleanup cost: 90 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable resin waste cost = wasted mixed resin weight × mixed resin cost × resin waste scope included.
  • total resin waste cost works out to 256 $ at these inputs, and this is the headline figure for the scenario.
  • resin waste cost per part or job works out to 7.54 $ / piece at these inputs.
  • variable resin waste cost works out to 166 $ at these inputs.
  • resin waste disposal and cleanup cost works out to 90 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where share of waste charged to this job sits at 100% and the headline result is 321 $, this scenario comes in 20.15% below the baseline at 256 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to share of waste charged to this job, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It uses a single average resin cost per pound, so blends with expensive additives, accelerators or short-pot-life systems that are wasted disproportionately will be undercosted.

Results at a glance

  • total resin waste cost: 256 $ (headline result)
  • resin waste cost per part or job: 7.54 $ / piece
  • variable resin waste cost: 166 $
  • resin waste disposal and cleanup cost: 90 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Resin Waste Cost calculator, set share of waste charged to this job to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.